Quarterly report pursuant to Section 13 or 15(d)

HELD-TO-MATURITY SECURITIES - Narrative (Details)

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HELD-TO-MATURITY SECURITIES - Narrative (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Held-to-maturity Securities [Abstract]    
Available For Sale Securities Transferred To Held To Maturity Securities   $ 3,000,000,000
Unrealized Net Losses Recognized In Oci At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities   $ 6,000,000
Other than temporary impairment losses, held-to-maturity securities $ 0